note 63 bit indices

Closes #3307
Raku · Mar 13, 2021 · 0f6bce5 · 0f6bce5
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commit 0f6bce5
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diff --git a/doc/Language/subscripts.pod6 b/doc/Language/subscripts.pod6
@@ -21,6 +21,10 @@ Raku provides two universal subscripting interfaces:
     { }  string or object keys  Associative    Hash, Bag, Mix, Match, ...
 =end table
 
+Note that Rakudo's implementation of subscripting allows only 63 bits on
+64 bit builds. See
+L<Stack Overflow|https://stackoverflow.com/questions/61031107/do-array-indices-need-to-be-native-ints/61031617#61031617>
+
 =head2 B<Positional> subscripting
 
 B<Positional> subscripting(via L<C<postcircumfix [